Hall Induction Touch Panel Slimming Display Thickness
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Solution Overview
Problem
Conventional touch-screens with integrated touch-sensing modules increase the thickness of display panels due to the need for additional components like magnetic sensing coils, which contradicts the goal of slimming down display technology.
Innovation Solution
A touch-screen system where a magnetic component in the stylus interacts with Hall induction plates integrated within the display panel, allowing the touch module to detect touch positions without the need for external sensing coils, thereby reducing the overall thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetic sensing coils are added to the display panel for EMR touch sensing, then touch-sensing function is achieved, but the thickness of the display panel increases
Solution Approach 1:
The touch module is integrated within the display panel by merging the sensing units with the existing display structure. The sensing units are disposed in the display panel at different positions, combining the display and touch-sensing functions into a single integrated structure, thereby avoiding the need for separate external sensing coils that would increase thickness.
Solution Approach 2:
The sensing units utilize the magnetic field dimension for touch detection while maintaining the display panel's structural dimensions. By detecting magnetic field variations caused by the stylus's magnetic component, the system achieves touch sensing without adding physical thickness to the panel structure.
2Measurement precision
If additional magnetic sensing coils are integrated into the display panel, then magnetic field sensing capability is improved, but the overall device complexity increases
Solution Approach 1:
The touch module is divided into multiple sensing units distributed at different positions within the display panel. Each sensing unit independently detects magnetic field variations, and the controller integrates signals from these segmented units to determine touch position, thereby achieving comprehensive magnetic field sensing without requiring a single complex sensing system.
Solution Approach 2:
The sensing units serve dual purposes: they function as both display elements and magnetic field sensors. This multi-functionality reduces the need for separate dedicated sensing components, thereby improving magnetic field sensing capability without proportionally increasing device complexity.
3Measurement precision
If sensing units are distributed in array arrangement within the display panel, then touch position detection accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The display panel is segmented into multiple sensing units arranged in an array, with each unit responsible for detecting magnetic field variations in its specific region. This segmentation enables precise touch position detection through spatial distribution while allowing standardized manufacturing of individual sensing unit modules.
Solution Approach 2:
The sensing units utilize changes in magnetic field parameters (strength and direction) caused by the stylus's magnetic component to determine touch position. By detecting parameter variations rather than requiring complex physical measurements, the system achieves high detection accuracy with relatively simple manufacturing processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This integration enhances touch-sensing accuracy by using differential comparison circuits to differentiate between magnetic fields, reducing false positives from ambient fields and maintaining a slim display panel design.
Implementation Method 1
Each of the sensing units includes a Hall induction plate for sensing a magnetic field established by the magnetic component and forming an induction output voltage respectively
Data Source
AI summary
A touch-screen system including a stylus, a display panel and a touch module is disclosed herein. The stylus includes a magnetic component. The touch-sensing module is disposed within the display panel. The touch-sensing module includes a plurality of sensing units distributed at different locations as an array over the display panel. Each of the sensing units includes a Hall induction plate for sensing a magnetic field established by the magnetic component and forming an induction output voltage. The touch module detects a touch position of the stylus according to the induction output voltages from the sensing units.